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<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
         function Calc(a,b){
         this.add=function(){
         return a+b;
        }
        this.sub=function(){
        return a-b;
         }
        this.mul=function(){
        return a*b;
         }
         this.div=function(){
        if(b===0){
        return "b不能为0";
         }
        else{
        return a/b;
        }
        }
        }
        let calc=new Calc(32,43);
         let r1=calc.add();
         let r2=calc.sub();
        let r3=calc.mul();
         let r4=calc.div();
         console.log(r1,r2,r3,r4);
        </script>
</body>
</html>